Each pair of homologous chromosomes have the same genes in the same loci but do not necessarily have the same alleles. During crossing over genetic material is exchanged between homologous chromosomes.The chromosomes become twisted around each other and the tension breaks off portions of the chromatids. The portions rejoin randomly and may reattach to the same chromosome or the other member of the pair. In this way new combinations of alleles are formed.
The origin of each one of the pair of homologous chromosomes is different.One is maternal in origin(from an egg cell) and one is paternal in origin (from a sperm cell) usually from possibly unrelated individuals by random mating and by random fertilisation.They have the same genes in the same loci but do not necessarily have the same alleles.During crossing over genetic material is exchanged between homologous chromosomes leading to more variation.The offspring will not inherit any chromosome identical to a parental chromosome.
The origin of each one of the pair of homologous chromosomes is different.One is maternal in origin(from an egg cell) and one is paternal in origin (from a sperm cell) usually from possibly unrelated individuals by random mating and by random fertilisation.They have the same genes in the same loci but do not necessarily have the same alleles.During crossing over genetic material is exchanged between homologous chromosomes leading to more variation.The offspring will not inherit any chromosome identical to a parental chromosome.